Release 2.5.1 - add dependency constraint for omniauth 1.x#17

koshilife wants to merge 3 commits intoginjo:masterginjo/omniauth-slack:masterfrom

koshilife:#16_add_dependency_constraint_for_omniauth_1.xkoshilife/omniauth-slack:#16_add_dependency_constraint_for_omniauth_1.xCopy head branch name to clipboard